TEIID LIZAT^DS OF THE GEXUS CXEMIDOPHORUS 167 



" As to the name of the form, I have to remark that the specimens 

 have been carefully compared and found identical with Hallowell's 

 type specimens. It will be observed that in the ori<2;inal description 

 of undulatus the locality of the type is stated to be ' near Fort Yuma 

 in the San Joaquin Valley,' but the self-contradiction of this state- 

 ment is exi)lained by the fact that Fort ^Nlillei-, Fresno County, is 

 meant, aud not Fort Yuuia. on the Colorado River." 



Thus, it is seen that ii)idnf<ttus is the foothill phrase of tesseUatus 

 in the west and that it is correspondingly darker above than the 

 desert type. At tins point it seems logical to introduce still another 

 form. ^fej)ie(/('rl. wliieh lias been found to be but an intensification 

 or further development of luiduhttus. 



\i\\\ Denburgh described xie}i\e(nrl in lSi)4 from a series of thir- 

 teen specimens taken along the west coast of the northern district 

 of Lower California. He said that "■ (' nen^hjophor') from north- 

 ern Lower Caiifoi'iiia and IVoni San Diego County. California. 

 j)i-esent much the general appearance of (' . fiarix vn(hil(ifus (Hal- 

 lowell). 'J'hey ditler from that form in having the dorsal scales 

 smaller, the gular scales and the scales on the collar largei'. and in 

 the presence of large and well-defined black spots on the gular re- 

 gion. From C. ti</r/s Baird and (iirard they differ by the character 

 of the scales as above indicated, by the absence of the slate-colored 

 suffusion on the gular region, and by the well-defined black markings 

 on the sides of the head. 



" As shown by Doctor Stejneger, C. tigris is the desert form found 

 in eastern California as far south as the MohaA'e Desert, in southern 

 Idaho, in Nevada, and in Utah. C. tigris unduJafu.s inhabits the 

 western slopes of the Sierras, and is also found on the western side 

 of the interior valley of California as shown by specimens in Stan- 

 ford University from Kelseyville, in Lake County, and from Los 

 Gatos, Santa Clara County." 



When series are studied, it becomes obvious that the distinctions 

 between stejnegeri and vnduJatus based on the dorsal granules and 

 the gular and mesoptychial scutellation are highly variable and 

 hence worthless. These same characters do not offer a separation 

 from the specimens of the Great Basin Avhich have been mentioned 

 above as tigris, so this confines our discussion largely to facts 

 concerning the coloration. 



The differences between iindidatiis and stejncgci-i. as outlined by 

 Van Denbui'gh. were sinnniai-ized in a key by ^NIcLain (INOO/^ \). 9) 

 as follows : 



S|Mifs (III llini.-il few ;iii(l siiuill: cfiilr;!! ;^iil;ii' ;iiiil colliii- sc-;ilrs liiruci'. 



C. t. undulatus 



Spets (»ii tlinmt miiiierous and larue. ol'ten 1'(n-iiiin;j; irre.milnr transverse liaiids; 



gular and cor.ar scales larger C. t. stejnegeri. 



